Brad, are these a science experiment or actually going on your engine? I am wondering where your going with this?
It looks like on the previous heads, you have unshrouded the chamber to the gasket line. I have not found any mid to high flow gains by doing that, although I've never worked a set of Victors.
You can start conservatively by scribing the actual bore line onto the heads, the Victor chambers look small enough to try that.